CN1068094C - Method for regulating oil jet speed in electrically controlled plunger pump jet system - Google Patents
Method for regulating oil jet speed in electrically controlled plunger pump jet system Download PDFInfo
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- CN1068094C CN1068094C CN97119088A CN97119088A CN1068094C CN 1068094 C CN1068094 C CN 1068094C CN 97119088 A CN97119088 A CN 97119088A CN 97119088 A CN97119088 A CN 97119088A CN 1068094 C CN1068094 C CN 1068094C
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Abstract
The present invention relates to a method for regulating oil jet speed in electrically-controlled plunger pump jet systems, particularly to an electrically-controlled oil jet system of diesel engines. The present invention is characterized in that low oil jet speed during an initial stage is realized by the cooperation of a flow discharge channel installed on a plunger group and an electromagnetic bypass control valve at switch-off time at the initial stage of oil supply by a plunger. Other control devices do not need to be added in the method, and the structure is simple. The length and the amplitude value of the low oil jet speed stage during the initial stage can be adjusted by reasonably matching the structural size of the flow discharge channel and oil jet timing. A needle valve is completely switched on during the initial stage of the oil jet speed, which is convenient for accurately controlling the oil jet quantity of the initial stage and is favourable for the atomization of fuel oil.
Description
The present invention relates to a kind of electronic controlled diesel fuel injection apparatus, regulate the plunger assembly of injection rate in particularly a kind of plunger pump fuel injection system of solenoid valve overflow control.
In recent years, injection rate control is considered to optimize diesel engine combustion, control discharging and keeps good fuel economy to have the method for potentiality.Injection rate controlling method and device have polytype and structure, but the overwhelming majority influences its effect because of its complex structure or to some parameter sensitivity, still can not obtain actual application.
In the prior art, can realize control with the process of setting up of regulating fuel pressure to injection rate by changing the oil spout pump structure.For example twice delivery stroke formula of mechanical type ejection control device is to realize the Control with Pilot Injection function by pre-spray mechanism is set on plunger and plunger bushing.This device is to put in the control of plunger bushing or plunger to process a pre-spray spill port, and is relative with pre-spray slit on the plunger, forms the pre-spray fuel feeding before one time at normal fuel injection stroke (main injection fuel feeding), obtains delivery stroke twice.This device is after structure is determined, the pre-spray delivery stroke is certain, cam of injection pump molded lines and fluid power characteristic are depended in interval between pre-spray and the main injection, and along with the raising of rotating speed, the separated type pre-spray type of injection rate during by low speed is converted into low initial stage fuel injection rate spraying.In the plunger pump fuel injection system of solenoid valve overflow control, adopt usually and in a circulation, make twice energising of solenoid valve, form the process of boosting twice, thereby produce pre-spray.Because needle-valve is in quick condition in the single shot injection event, and not exclusively rises, pre-fuel injection quantity is comparatively responsive to some structure and adjustment parameter, requiring under the less situation of pre-fuel injection quantity, be unfavorable for the accurate control of pre-fuel injection quantity, therefore, these systems await further to improve and are perfect.
Purpose of the present invention and task are to be implemented in to make the solenoid valve once electrification and the process of once boosting in the circulation in the plunger pump injection system of solenoid valve overflow control, and make the needle-valve complete opening, form the spray characteristic of controllable low initial stage injection rate, to obtain to satisfy the fuel injection characteristic of working condition requirement.
Above-mentioned purpose and task are achieved through the following technical solutions: in plunger fuel feeding process, the engine speed and the position signal that record according to sensor by microcomputer control unit, to the pulse of giving an order of Electromagnetic Control bypass valve, it is closed, the formation process of boosting, produce and spray, it is characterized in that at the plunger fuel feeding process initial stage, match with the close moment of electromagnetism bypass control valve (BCV) by the current by pass that on plunger assembly, is provided with, realize low initial stage injection rate, the effective interaction length of current by pass was regulated when the length of low injection rate section was leaned on closed electromagnetic valve.
Current by pass is to open one section dredging flow groove over against the direction of barrel supply port one side downwards from the top of plunger; Also can process one section platform over against the direction of barrel supply port one side downwards at the top of plunger, perhaps open slit one on the top of barrel supply port, this slit is connected with low service system.Like this, after plunger is closed oil inlet hole, rely on the earial drainage of this little current by pass to control the pressure rising of plunger cavity, thereby obtain low oil-supply speed.
The present invention compared with prior art has the following advantages and beneficial effect: the present invention is not owing to need additional other control gear, thereby structure, technology are simple; The initial stage length and the amplitude of low injection rate section can be regulated, and can by physical dimension and the injection timing that reasonably mates current by pass, obtain comparatively ideal injection rate shape according to the specific requirement to the injection rate shape; Injection rate initial segment needle-valve is a complete opening, is convenient to the accurately control fuel injection quantity in early stage, helps the atomizing of fuel oil, realizes the optimization to combustion process, reduces the generation of noxious emission, reaches the effect of control diesel emission.
Accompanying drawing 1 is the injection rate oscillogram.
Accompanying drawing 2 is for to open one section dredging flow groove at the top of plunger over against the direction of barrel supply port one side.
Accompanying drawing 3 is for to open one section platform at the top of plunger over against the direction of barrel supply port one side.
Accompanying drawing 4 is for to open slit one on the top of barrel supply port.
Accompanying drawing 5 is electric control linearly arranged pump-pipe-valve-nozzle injection system fundamental diagram.
Below in conjunction with description of drawings theory structure of the present invention and most preferred embodiment:
The design of current by pass: plunger bushing 12 is provided with oil inlet hole 14, do not establish spiral chute on the plunger 11, current by pass is to open one section dredging flow groove 16a or process one section platform 16b over against the direction of barrel supply port one side downwards from the top of plunger, perhaps open one slit 16c (referring to Fig. 1) on barrel supply port top, like this, after plunger head is closed oil inlet hole, between plunger cavity 13 and oil inlet hole 14, exist one section current by pass.The sectional area size of dredging flow groove depends on the diameter of plunger and how much oil-supply speeds of plunger, and the length of dredging flow groove depends on the length of the low initial stage oil spout section of required acquisition.For example, for realizing comparatively ideal injection rate shape, dredging flow groove can adopt following size in the used AD type Injection Pump of Medium Truck: long 2.0mm, wide 0.5mm, dark 1.0mm.
Most preferred embodiment: following is example with accompanying drawing 5, promptly with Chinese invention patent application " electric control linearly arranged pump-pipe-valve-mouth diesel injection system " (number of patent application: be that example illustrates the implementation process that realizes low initial stage injection rate control 97112028.5).This system comprises microcomputer control unit 1, decoupling type high pressure oil pump 2 in upright arrangement, high-pressure oil pipe 3, parts such as Electromagnetic Control bypass valve 4 and oil sprayer 5 and low service system 6.
Decoupling type oil pump 2 in upright arrangement is in-line multi-cylinder pumps of a kind of simplification.This pump mainly comprises parts such as the pump housing 7, camshaft 8, roller 9, piston spring 10, decoupling type plunger 11, integrated type plunger bushing 12.Be provided with oil inlet hole 14 on integrated type plunger bushing 12, do not establish spiral chute on the decoupling type plunger 11, plunger coupled parts is no longer born the fuel-flow control function, only bears the fuel feeding pressurization function.In order to realize initial stage injection rate control, open one section dredging flow groove 16 over against the direction of oil inlet hole at the top of plunger.
Microcomputer control unit 1 is by the microprocessor software and hardware and be contained in rotating speed on the camshaft and but the various sensors of position transducer and detection of engine state are formed.Its working procedure is: microcomputer receives the signal from sensor, and through the analysing and processing of control software, to the pulse of giving an order of Electromagnetic Control bypass valve, thereby the control bypass valve opens or cuts out.
The working procedure following (referring to Fig. 5) of this electric control linearly arranged pump-pipe-valve-mouth type diesel injection system:
Oil-filled process: when fuel feed pump plunger 11 is descending, plunger bushing 12 oil inlet holes are opened, bypass valve 18 is opened, at this moment, the ejecting system internal pressure will drop to the pressure that is lower than low-pressure oil supply system, and the fuel oil of low service system will enter high-pressure injection system by oil inlet hole on the plunger bushing 14 and bypass valve valve port 19 this moment.
The bypass process: when plunger was up, plunger cavity 13 pressure rose, as long as bypass valve 18 still is in opening state, the pressurized fuel oil just through bypass valve valve port 19 high speed earial drainages, is got back to low-pressure oil supply system.
Course of injection: in the plunger delivery stroke, when computer control unit 1 basis is contained in pump speed and the position signal that the sensor on the cam of injection pump axle records, when sending control impuls and connecting electromagnet 17 a specific moment, bypass valve 18 adhesives, valve port 19 quick closedowns, plunger cavity 13 pressure begin to rise, but this moment is because the existence of the current by pass between plunger cavity 13 and the oil inlet hole 14, a part fuel oil since then current by pass to the oil inlet hole earial drainage, suppress the too fast rising of plunger cavity pressure, the charge oil pressure ripple passes to the mouth end and makes needle-valve 20 rises at this moment, formed the initial fuel injection section (the I section among Fig. 1) of low rate, subsequently when current by pass is fully closed, the plunger cavity fuel pressure rises rapidly, when forming main fuel feeding ripple and passing to the mouth end, form the main injection section (the II section among Fig. 1) of high fuel injection rate, injection rate presents waveform shown in Figure 1.
Uninstall process: end when control impuls, during electromagnet 17 dead electricity, bypass valve 18 is opened under the effect of return spring fast, and high pressure fuel directly communicates with low-voltage fuel, high pressure fuel through bypass valve valve port 19 to low service system high speed earial drainage.
As seen low initial stage fuel injection rate section is that the earial drainage effect by current by pass produces, and the effective earial drainage length of current by pass action length the when length of low fuel injection rate section is closed with bypass valve is relevant; Simultaneously, early stage, the injection rate size was also relevant with the current by pass circulation area.Obviously, injection timing (control valve close moment) shifts to an earlier date, and effectively earial drainage length increases, and vent flow increases, and early stage, stress level was low, and injection rate is corresponding less.According to the requirement of diesel engine combustion, along with the rising of rotating speed, injection timing should correspondingly shift to an earlier date; Simultaneously, pump speed improves, and the plunger oil-supply speed increases, and plunger cavity pressure climbing speed also can be accelerated, and like this, the result of two aspect comprehensive functions can obtain required injection rate in early stage.Therefore, according to concrete type, rational Match current by pass physical dimension, Injection Pump structure and injection timing can obtain comparatively ideal injection shape.
Applicable scope of the present invention: second generation electrically controlled plunger pump injection system, i.e. the pump nozzle of the axial piston proportioning pump of the pump in upright arrangement of solenoid valve overflow control, solenoid valve overflow control, the monoblock pump of solenoid valve overflow control, solenoid valve overflow control.
Claims (3)
1, a kind of plunger assembly that is used for the electronic controlled diesel fuel injection system, it is made up of plunger bushing and plunger two-part, has oil inlet hole on the described plunger bushing, it is characterized in that opening one section dredging flow groove over against the direction of barrel supply port one side downwards at the top of plunger.
2, a kind of plunger assembly that is used for the electronic controlled diesel fuel injection system, it is made up of plunger and plunger bushing two-part, has oil inlet hole on the described plunger bushing, it is characterized in that processing one section platform over against the direction of barrel supply port one side downwards at the top of plunger.
3, a kind of plunger assembly that is used for the electronic controlled diesel fuel injection system, it is made up of plunger and plunger bushing two-part, has oil inlet hole on the described plunger bushing, it is characterized in that opening slit one on the top of barrel supply port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119088A CN1068094C (en) | 1997-10-24 | 1997-10-24 | Method for regulating oil jet speed in electrically controlled plunger pump jet system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119088A CN1068094C (en) | 1997-10-24 | 1997-10-24 | Method for regulating oil jet speed in electrically controlled plunger pump jet system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1215796A CN1215796A (en) | 1999-05-05 |
| CN1068094C true CN1068094C (en) | 2001-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97119088A Expired - Fee Related CN1068094C (en) | 1997-10-24 | 1997-10-24 | Method for regulating oil jet speed in electrically controlled plunger pump jet system |
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| Country | Link |
|---|---|
| CN (1) | CN1068094C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101612413A (en) * | 2008-06-24 | 2009-12-30 | 上海露泉环境工程有限公司 | Superfine atomization and deodorization system |
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1997
- 1997-10-24 CN CN97119088A patent/CN1068094C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1215796A (en) | 1999-05-05 |
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Granted publication date: 20010704 Termination date: 20151024 |
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